Re: Front end wheel knock.

Couple of things.

Loose wheel or incorrectly installed wheel. Clean hub and torque the wheel

nuts.

Outer CV shaft  joint is moving in joint because the clip has come loose
or 
missing.

Disk Brake pads moving inside the calliper.
Had that problem with a Ford Focus. The aftermarket pads backing plate was

too large and when I went over a bump or accelerated/slowed  I would get a

knock. I was sure it was a drive shaft but after grinding a little off of 
the backing plates of the front pads the knock was gone.